Cord Arnold
Koordinator för Mötesplats Rydbergseminarier
Time-frequency representation of autoionization dynamics in helium
Författare
Summary, in English
Autoionization, which results from the interference between direct photoionization and photoexcitation to a discrete state decaying to the continuum by configuration interaction, is a well known example of the important role of electron correlation in light-matter interaction. Information on this process can be obtained by studying the spectral, or equivalently, temporal complex amplitude of the ionized electron wave packet. Using an energy-resolved interferometric technique, we measure the spectral amplitude and phase of autoionized wave packets emitted via the sp2+ and sp3+ resonances in helium. These measurements allow us to reconstruct the corresponding temporal profiles by Fourier transform. In addition, applying various time-frequency representations, we observe the build-up of the wave packets in the continuum, monitor the instantaneous frequencies emitted at any time and disentangle the dynamics of the direct and resonant ionization channels.
Avdelning/ar
- Atomfysik
- MAX IV-laboratoriet
- Synkrotronljusfysik
Publiceringsår
2018-01-23
Språk
Engelska
Publikation/Tidskrift/Serie
Journal of Physics B: Atomic, Molecular and Optical Physics
Volym
51
Issue
4
Dokumenttyp
Artikel i tidskrift
Förlag
IOP Publishing
Ämne
- Atom and Molecular Physics and Optics
Nyckelord
- attosecond pulse
- autoionization
- Fano resonance
- RABBIT
- time-frequency representations
- Wigner
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0953-4075